JPS5849500Y2 - heat storage tank - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a heat storage tank that stably supplies thermal energy to the heat demand side.

Generally, a heat storage tank is located between the heat supply side and the heat demand side.
On the heat supply side, in order to use energy effectively,
It is used to reduce the capacity of equipment on the heat supply side, and on the heat demand side to follow sudden changes in heat load.

In particular, thermal storage tanks are often used in solar thermal systems.

The reason for this is that it compensates for the dilution, uncertainty, and intermittency of solar heat, and makes it possible to stably supply the temperature and heat required by the heat demand side.

FIG. 1 is a schematic piping system diagram showing the case where the above heat storage tank is used in a solar thermal system.

In FIG. 1, a heat storage tank 1 stores the collected heat medium, and based on the density difference depending on the temperature of the heat medium, the high temperature heat medium stays in the upper side of the heat storage tank 1. A low-temperature heat medium is stored in the lower part of the heat storage tank 1.

The heat medium accommodated in the heat storage tank 1 in this way is transferred to the inflow pipe 3 connected to the lower part of the heat storage tank 1 with a pump 2.
The heat is guided to the heat collector 4 through the heat collector 4, where it absorbs solar heat and becomes high in temperature, and is circulated to the upper side of the heat storage tank 1 via the outflow pipe 5.

In addition, the high temperature heat medium stored in the heat storage tank 1 is
Heat is exchanged in a radiator 8 such as a heater through an inflow pipe 7 connected to the upper side of the heat storage tank 1 and equipped with a pump 6 .

The heat medium, which has undergone heat exchange in the radiator 8 and has become low temperature, is configured to circulate to the lower side of the heat storage tank 1 via the outflow pipe 9.

Here, the heat storage tank 1 is a heat collector 4 as a solar heat supply side.
and the radiator 8 as the demand side, it compensates for the dilution, uncertainty, and intermittency of solar heat, and enables the radiator 8 to stably supply the necessary temperature and amount of heat.
Therefore, it is required to have a large heat capacity, store heat in a high-temperature heat medium, and reduce heat loss to the outside.

Furthermore, for hot water supply, low-temperature water is supplied to a heat exchanger 11 via an inflow pipe 10, and in this heat exchanger 11, the water undergoes heat exchange and becomes hot water via an outflow pipe 12 to a demand location. is being supplied to.

In the above system, antifreeze is used to prevent freezing in the heat collector 4, but in this case, using antifreeze as the entire heat medium in the heat storage tank 1 is extremely uneconomical in terms of cost. However, there were problems such as oxidative deterioration due to the antifreeze coming into contact with air.

FIG. 2 shows a schematic piping system diagram of a solar thermal system using a heat storage tank with antifreeze measures.

In this figure, the difference from the conventional example shown in FIG. 1 is that the heat collection system is made into a closed loop.

That is, the inflow pipe 2 and the outflow pipe 5 are connected through the heat exchanger 13 in the heat storage tank 1, and the heat medium of the heat collection system is connected to the inflow pipe 3, the heat collector 4, the outflow pipe 5, and the heat exchanger 13. exchanger 1
It is designed to circulate through the route 3.

Therefore, since there are no changes to the other components, the same reference numerals are given to the other components, and the explanation thereof will be omitted.

With this configuration, only the heat collection system needs to be mixed with antifreeze, which reduces the amount of antifreeze, and since the heating medium does not come into contact with air, problems of oxidative deterioration do not occur.

However, such a configuration requires a heat exchanger for the heat collection system in addition to the heat exchanger for the hot water supply system.

Therefore, there are problems in that two heat exchangers are required, that their installation requires a lot of man-hours, and that the product price is also high.

FIG. 3 is a schematic piping system diagram showing a solar thermal system using a heat storage tank for storing latent heat.

This figure differs from the conventional example shown in FIG. 2 in that the heat radiation system used for heating and the like on the demand side is made into a closed loop.

Since there is no change in other configurations, the same reference numerals have been assigned and explanations have been omitted.

That is, the inflow pipe 7 and the outflow pipe 9 are connected within the heat storage tank 1 via a heat exchanger 14, so that the heat medium flowing to the radiator 8 is circulated only within the system.

Heat storage in the heat storage tank 1 is performed using latent heat of the heat storage medium within the tank 1.

The above-described configuration requires three heat exchangers, which requires a space to install them, requires more man-hours for assembly, and is more expensive.

This invention was made to solve the above-mentioned problems, and aims to provide an inexpensive heat storage tank that can perform efficient heat exchange and omit the normally used heat exchanger. do.

In order to achieve this objective, the present invention is based on a heat storage tank that stores heat energy, in which the wall of the heat storage tank is made of a material with good thermal conductivity, and the heat supply pipe and heat demand pipe are placed close to the wall surface. The tank wall is used as a heat exchange medium.

Hereinafter, embodiments of this invention will be described with reference to the drawings.

FIG. 4 is an explanatory diagram showing a first embodiment of the heat storage tank according to the invention in cross section.

In the embodiment shown in this figure, reference numeral 21 denotes a heat storage tank, and this heat storage tank 21 stores thermal energy supplied from the heat supply side (that is, the heat collection system) via a heat storage medium 22 in the tank 21. It looks like this.

The heat storage tank 21 is usually constituted by an envelope 23 surrounded by an iron plate, a stainless steel plate, a copper plate, or the like, and stores a heat medium 22 as shown in the figure.

A heat supply pipe 25 through which a heat medium on the heat supply side such as the heat collector 4 flows is connected to the inner surface of the wall 24 of this envelope 23.
A heat demand pipe 26 for flowing water for hot water supply as a heat demand side is connected to the heat supply pipe 25 at a target position on the outer surface of the heat supply pipe 4 .

The above embodiment is suitable for use in the case of the piping system shown in FIG. 2, for example.

Next, the operation of the first embodiment will be explained.

The heat medium supplied from the heat supply side such as the heat collector 4 is connected to the heat supply pipe 2.
5, the thermal energy is directly transmitted from the pipe 25 to the heat storage medium 22 in the heat storage tank 21, and also to the heat storage medium 22 in the heat storage tank 21.
is transmitted to the surface of the wall 24 of.

The thermal energy transferred to the wall surface of the envelope 23 is transferred to the heat storage medium 22 via the wall surface, and
It is also transmitted to the heat demand pipe 26 through which the heat medium flows on the demand side.

Therefore, thermal energy is transferred from the heat storage tank 21 etc. to the water as a heat medium flowing into the heat demand pipe 26 on the heat demand side via the surface of the wall 24, and the water is supplied to the demand place as hot water at a predetermined temperature. .

Of course, the heat consumed by the heat radiator etc. is transferred to the heat storage medium 22.
This can be obtained by circulating it through a radiator.

According to the first embodiment, the pipes 25 and 26 for flowing the heat medium on the heat supply side and the heat demand side are connected to the surface of the wall 24 of the envelope 23 forming the heat storage tank 21, so that the heat storage Tank 2
There is no need to provide a heat exchanger in the heat exchanger 1, and the number of assembly steps can be reduced, heat exchange can be performed efficiently, and the price can be reduced.

FIG. 5 is a schematic sectional view showing a second embodiment of this invention.

In this embodiment, the same components as those in the first embodiment are given the same reference numerals and their explanations will be omitted.

The embodiment shown in this figure is different from the first embodiment in that a heat supply pipe 25 for flowing a heat medium on the heat supply side and another pipe 27 for flowing a heat medium used for heating etc. on the heat demand side are alternately connected. It is at the point where it is placed.

Note that the reference numeral 28 is a heat insulating material surrounding the heat storage tank 21.

This embodiment is suitable for use in a latent heat storage system as shown in FIG. 3, for example.

FIG. 6 is an explanatory cross-sectional view, partially cut away, for explaining the operation of the second embodiment.

In this figure, a heat supply pipe 25 for flowing a heat medium on the heat supply side and a pipe 2 for flowing a heat medium used for heating etc. on the demand side
In step 7, thermal energy is input and output as shown by the arrows in the figure.

That is, the surface of the wall 24 of the envelope 23 forming the heat storage tank 21 acts as a fin for each of the heat exchange pipes 25 and 27, and the heat transfer area of each pipe 25 and 27 is reduced. It is something that increases.

Therefore, heat exchange becomes good and heat exchange is performed efficiently.

Further, since the hot water supply pipe 26 uses the heat supply pipe 25 through which the heat medium flows on the heat supply side as a fin, the heat transfer area is similarly increased.

According to the second embodiment, not only the heat exchange efficiency is improved as in the first embodiment, but also a normal heat exchanger is not required, and the price thereof is also reduced.

Further, due to this structure, the path of the hot water supply pipe 26 is separated by the partition wall 24 of the envelope 23, thereby increasing safety.

Further, this heat exchanger for hot water supply may have a certain capacity and have a function such as a hot water storage type, or it may be an instantaneous type.

When performing latent heat storage, it is possible to make the heat storage tank 21 into a thin plate shape due to the low thermal conductivity of the heat storage medium 22, but in this case, each heat exchange pipe 25,
26 and 27 can also serve as reinforcement for the surface of the wall 24 of the envelope 23 of the heat storage tank 21.

FIG. 7 is an explanatory diagram showing a third embodiment of the invention in cross section.

The embodiment shown in this figure differs from the second embodiment in that fins 29 are disposed within the heat storage tank 21 as shown.

Since the other components are the same, they are given the same reference numerals and their explanations are omitted.

By configuring as described above, when storing latent heat, it is possible to compensate for the low thermal conductivity of the heat storage medium 22 itself.

According to the third embodiment, the heat storage medium 2 used for latent heat storage
Even in cases where the thermal conductivity of No. 2 is poor, heat exchange can be performed efficiently.

Furthermore, since the fins 29 are simply attached to the pipes 25 and 27, the number of man-hours can be reduced.

In addition, in each of the above embodiments, the pipe 25 through which the heat medium flows on the heat supply side
And the wall 2 of the envelope 23 is connected to the pipe 27 that flows the heat medium on the demand side.
4, but it may of course be attached to the outer surface of the wall 24.

In this case, the efficiency of heat exchange will decrease slightly, so the piping 2
5 and 27 may be flattened.

With such a configuration, assembly becomes easier.

As described above, according to this invention, the envelope forming the heat storage tank is made of a material with good thermal conductivity, and the heat supply pipe and the heat demand pipe are directly fixed to the wall surface in close proximity. This has the advantage that heat exchange can be performed quickly and efficiently, and that the structure of the heat storage tank can be simplified by using the tank wall of the heat storage tank that stores the heat storage medium as the heat exchange medium.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic piping system diagrams showing a solar thermal system using a conventional heat storage tank, Figure 4 is an explanatory diagram showing a cross section of the first embodiment of this invention, and Figure 5 is the second embodiment of the same. An explanatory diagram showing the embodiment in cross section, FIG. 6 is an explanatory diagram showing a cross section with a part cut away to explain the action of the second embodiment, and FIG. 7 is an explanatory diagram showing the third embodiment in cross section. It is. 21... Heat storage tank, 22... Heat storage medium,
23...Envelope, 24...Wall, 25.
...Piping for flowing the heat medium on the heat supply side, 26...
・Pipes that flow the heat medium (water) on the heat demand side (for hot water supply), 27.
...Piping that carries the heat medium on the heat demand side (heating, etc.), 2
9...Fin.

Claims (3)

[Scope of utility model registration request] (1) In a heat storage tank for supplying thermal energy stored in a heat storage medium to a demand side through heat exchange, an envelope of the heat storage tank is formed of a material with good thermal conductivity, and the envelope of the heat storage tank is made of a material with good thermal conductivity. A heat storage tank characterized by having heat supply pipes and heat demand pipes closely fixed directly to a wall surface. (2) Claims for registration of a utility model characterized in that a heat supply pipe is fixed to the inner wall surface of the envelope of the heat storage tank, and a heat demand pipe is fixed to the outer wall surface of the envelope at the same position as the heat supply pipe. The heat storage tank according to paragraph 1. (3) The heat storage tank according to claim 1, which is a utility model registration, characterized in that a heat supply pipe and a heat demand pipe are fixed to the inner wall surface of an envelope of the heat storage tank.